PETROLEUM GEOLOGY IN THE NORTHEASTERN PART OF BONAPARTE BASIN

The Jurassic and Late Cretaceous are the major exploration targets for oil and gas in the northeastern part of Bonaparte Basin. The distribution and maturity of source rocks, TOC, reservoir properties and the distribution of cap rocks are studied in this paper. It is proved that the mudstones in the Echuca Shoals FM, Elang FM, Upper Plover FM and Cleia FM are favorable source rocks, and the sandstone in the Upper Plover FM and Elang FM are favorable reservoirs. Two reservoir-seal combinations have been identified so far. For the upper one, reservoirs occur mainly in the Elang FM and Plover FM, with the Cleia mudstone as the direct seal and the Cretaceous thick shale of the Bathurst Island Group as the regional seal. For the lower one, the Plover sandstone is the favorable reservoir with the Upper Plover mudstone as the direct seal. The regional seal is missing, so the upper combination is a better exploration target.